单项选择题

The management system of the rapid transit rail lines ______.

A．is already quite developed
B．does not exist at all
C．is not good enough
D．needs to include the strict guidelines
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单项选择题
In the building of the rail lines, ______.
A．more equipment made in China should be used
B．more imported equipment should be used
C．more exported equipment should be used
D．more equipment used in infrastructure projects should be used
单项选择题
LOGO is unique because ______.
A．it is an educational program
B．it is in total control of human beings
C．it allows children to teach the computer to think
D．children use it
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